Hypodermic syringe



,4x .,DU.1\IBARl HYPODERMIG SYRINQB.

No. 361,750. PatentedApr. 26, l1887..

UNITED STATES l PATENT Gruen.

ADDISON DUNBAR, OF CAMPBELL, TEXAS.

HYPoDi-:Rlvllc sYRiNeE.

rS15'IElCIEIC'A'lION forming part of Letters Patent No. 361,750, dated April 26, 1887.

Application filed November-29, 1886. Serial No. 220,191. (Model.)

To all whom t may concern:

Be it known that I, ADDISON DUNBAR, a citizen of the United States, residing at Campbell, in the county of Hunt and State of Texas, haveinvented certain new and useful Improvements in Hypodermic Syringes, of which the following is such a full, clear, and exact description as will enable others skilled in the art to which the invention appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and igures of reference marked thereon.

My invention relates especially to improve ments in combined hypodermic syringes and lances; and the especial object of the improvement is to provide means for inserting the` needle Without pain to the patient; and it also aims to improve the construction and operation of this class of devices, as will be hereinafter fully described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a side elevation of my improved device. Fig. 2 is a central vertical longitudinal section of the same. Fig. 3 is a vertical cross-section of the device on line x Fig. 1. Fig. 4 is a de tail perspective view of the needle-carrier; and Fig. 5 shows the lance, which may be substituted for the needle shown in the other gures.

Referring to the drawings by letter, A designates a hollow tube or barrel having a cutaway side portion, n.. IVithin this barrel A, I place a transparent tube, B, made, preferably, of glass,and this tube has a series of graduations, b, marked upon that part thereof which passes along or covers the cut-away side portion, a, of the barrel A. The graduations are viewed from the outside through the cut-away portion of the barrel, and indicate the amount of medicine in the syringe, so that the physician can readily determine the dose. The ends of the barrel A are externally screw-threaded, and one end4 is closed by a cap, C, screwed thereon. The piston-rod D works through this cap and carries the piston d on its inner end, and is provided with an enlarged head, knob, or button, d. on its outer end, and which forms a vhandle therefor. The piston d its tightly against the inner surface of the tube B, and the button or head d forms a bearing for the .thumb of the operator when the derier and the diaphragm f.

vice is in use. E is a nut or stop longitudinally adjustable on the piston-rod, to Alimit the motion of the same.

F is a sleeve secured upon that end of the barrel A which is not closed by the cap C, and this sleeve has a diaphragm, f, near one end, which, when the sleeve is secured upon or to the barrel, will fit up close against the end of the said barrel and prevent the escape of medicine from the barrel, except as hereinafter specified.

The diaphragm fis perforated at its center, and through this perforation extends one end of a small outlet-tube, G. This end of the said outlet-tube projects a short distance into the tube B, and is provided at its eX- treinity with a small annulariiange, g, the function of which will presently appear. The other end of this outlet-tube G screwsinto the needle-carrier H, and the needle-carrier is formed with al central longitudinal channel, 71, which communicates with and forms, prac-tically, a continuation of the said outlet-tube. The needle l is provided with an enlarged internally-screw-threaded socket, t', which engages the needle-carrier to secure the needle thereto. The needle also is provided with a longitudinal tubular passage, t', as shown, which extends the entire length ofthe needle, and communicates with the passage 7i in the needle carrier. The needle carrier is provided with arearWardly-extending cylindrical portion, J, nade integral therewith, and extending nearly to the diaphragm f in the sleeve F. This cylindrical projection J is provided with an annular groove, j, which is engaged by a latch,K,to hold the needle-carrier within the sleeve F. L is a coiled spring arranged around the tube G within the cylinder J, and havingits ends bearing against the needle-car In use this spring exertsacontinual pressure on theneedle-carrier and tends toproj ect it from the sleeve, as willbe readily understood. Thel'atch K is an open rectangular frame, which surrounds the sleeve F,

and the lower cross-bar, of which passes througha slot in the said sleeve to engage the groove j in the cylinder J. The latch isheld upon the sleeve by a bracket or attaching-plate, M, thel edges of which, m, are provided with notches, through which the side bars of the latch pass. This attaching-plate M is secured IOO to the sleeve F by means of a screw, fm', which is passed through the plate into the sleeve,

and, where so desired, this screw may be eX 4it is projected.

The upper cross-bar, k', of the latch is provided with a button, K2, by means of which the latch may be depressed.

N is a coiled spring placed between the upper cross-bar of the latch and the sleeve F. This spring N, it-will be readily seen, serves to hold the latch in engagement with the groove in the cylinder J.

-O is the lance, which may be substituted for the needle I when it is .desired to lance. abscesses, tumors, Src. It will be seen that it is of the same general construction as the needle, and is secured to the needle-carrier in the same manner.

In operation, morphine or other medicine is placed in the tube B, and the piston-rod then placed therein, and secured by screwing the cap C up on the end of the barrel A. The de-l vice is now placed in operative position-z'. c., with the needle-point resting against the skin of the patient. A slight pressure on the button K will release the latch K from engagement with the cylinder J, when the spring L will cause the needle-carrier to immediately project itself from the sleeve F, and the needle will piercethe skin with such rapidity as to be painless. The piston is now operated in the usual manner to inject the medicine, which will pass th rough t-he tube, the needle-carrier, and the needle into the flesh of the patient.

It will be seen fromv the drawings that the needle-carrier will not be projected from the sleeve F entirely, as that is prevented by the flange'g contacting with the diaphragm f, or, rather, washers placed thereagainst, for it will be readily understood that Washers and other packing are employed at all the joints to prevent leakage, and though I have shown them in the draWings,I have thought it unnecessary t0specifically refer thereto herein.

From the foregoing descripti`on,taken in connection with the accompanying'drawings, the advantages of my device will be readily appreciated, and need not be further referred to herein.-

` Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is Y 1. The combination, in a syringe, of the spring-actuated needle-carrier working in said sleeve, and a latch carried by said sleeve and engaging the needle-carrier, substantially as set forth.

2. The combination, in a hypodermic syringe, of a barrel, a sleeve secured thereto, a spring-actuated needle-carrier working in said sleeve, an outlet-pipe secured to the needlecarrier and extending into the barrel, a tubular needle secured to the needle-carrier, and a spring-actuated latch secured to the sleeve to retain the needle-carrier therein, substantially as set forth.

3. In a syringe, the combination of a barrel, a sleeve secured to said barrel and having a diaphragm adapted to close the end of the barrel, a needle-carrier having a cylindrical projection working in the sleeve, an outlettube secured to the needle-carrier and extending through the diaphragm in the sleeve, and a coiled spring arranged around said tube within the cylindrical projection of the needlecarrier, substantially as specified.

4. In a syringe, the combination of the barrel, the sleeve secured to the barrel, the needlecarrier working in said sleeve and having an annular groove, and a spring-actuated latch secured to said sleeve and engaging the annular groove in the needle-carrier, substantially as set forth.

GEO. L. PEELER, SIDNEY HARRISON.

barrel, a sleeve secured at one end thereto, a 

